Mattermost

Mattermost is a secure team collaboration platform built for mission-critical operations. It provides persistent messaging channels, threaded conversations, file sharing, native audio calls, and workflow automation through Playbooks — a feature that turns repeatable processes into guided, trackable procedures. The platform is designed for deployment on private infrastructure, air-gapped environments, or sovereign cloud, giving organisations complete control over their communication data.

Deep integration with developer and security tooling supports use cases such as incident response, ChatOps, and DevSecOps workflows. Granular access controls, end-to-end encryption, audit logging, and compliance certifications make it suitable for highly regulated environments. AI agent capabilities are built into the platform for automating routine tasks and surfacing relevant information.

Mattermost is used by defence agencies, critical infrastructure operators, healthcare organisations, and enterprises that need a communications platform with strict security requirements and no dependency on external cloud vendors.